●Harder than the standard slider. Polisport swing sliders are perfect replicas of the original parts manufactured in TPU to better withstand the friction and abrasion of your bicycle chain. ●This is where it all began, 30 years ago - Polisport started building aftermarket parts so that everyone could enjoy their bikes without worry and with even better looks and improved performance. ●Performance plastics kick-started its success and are still the core of Polisport.Injection-molded polyurethane Chain Slider.Tougher than stock slider.Direct O.E.M.